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660 Carb leaking Gas

This is a discussion on 660 Carb leaking Gas within the Engine forums, part of the Technical category; I just purchased a used 2005 660 in really nice shape. I havn't rode it any great distance because its so cold....but after i got ...


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Old 02-19-2010, 10:12 PM
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660 Carb leaking Gas

I just purchased a used 2005 660 in really nice shape. I havn't rode it any great distance because its so cold....but after i got it home i noticed a big puddle of gas under it after i parked it. After some looking i noticed that it was coming from a vent tube on the passenger side of the carb. I thought maybe the float was sticking so i completely disassebled the carb and cleaned it out well and adjusted the float to 13 mm like the service manual states. Put it all back together and though it is running well it is still leaking....pretty badly. I'm at a loss....anyone have this happen before. The only other thing i can think of is there is an aftermarket msd single cylinder programmer installed that might be causing it. I have no idea if it is adjusted properly or if this could even cause something like this. I'm planning on taking it off and reverting it back to stock as i have no interest in messing with programming it. If anyone is interested i will sell it cheap...or trade it for a sport steering wheel. Anyway i'm attaching a diagram of the vent hose its leaking from...as well as the aftermarket cdi.


Vent number 5 is the one i'm talking about.



This is the cdi...if anyone wants to buy it.
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Old 02-19-2010, 10:43 PM
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The CDI is not your problemb.
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Old 02-19-2010, 10:50 PM
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Uh, yeah - the CDI is not the problem. It controls ignition - not fuel!

You probably have an incorrectly adjusted float, or a leaking needle valve. Take the carb apart and give it a good cleaning and adjust the float. You can check the needle valve at the same time.

But seriously - don't give up your MSD for like $40 - it's worth like $250! (I think - the non-programmables are about $180).
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